docs: update roadmap

Author: dmitryusenko

README.md

@@ -258,18 +258,20 @@ const ownsTheCar = await classifier.predict([0.2, 0.76, 0]);
 - [x] Asynchronously loaded datasets ([#14](https://github.com/RonasIT/tfjs-node-helpers/issues/14))
 - [x] Feature normalization ([#5](https://github.com/RonasIT/tfjs-node-helpers/issues/5))
 - [x] Custom metrics ([#18](https://github.com/RonasIT/tfjs-node-helpers/issues/18))
+- [ ] Add more metrics ([#17](https://github.com/RonasIT/tfjs-node-helpers/issues/17))
+- [ ] Refactor features ([#25](https://github.com/RonasIT/tfjs-node-helpers/issues/25))
 - [ ] Task-oriented architecture ([#26](https://github.com/RonasIT/tfjs-node-helpers/issues/26))
-- [ ] Add an example of queued feature extraction and evaluation ([#12](https://github.com/RonasIT/tfjs-node-helpers/issues/12))
-- [ ] Add an example of storing the extracted features ([#13](https://github.com/RonasIT/tfjs-node-helpers/issues/13))
 - [ ] Categorical features ([#19](https://github.com/RonasIT/tfjs-node-helpers/issues/19))
 - [ ] Multiclass classification ([#3](https://github.com/RonasIT/tfjs-node-helpers/issues/3))
-- [ ] Regression ([#2](https://github.com/RonasIT/tfjs-node-helpers/issues/2))
 - [ ] Image classification ([#4](https://github.com/RonasIT/tfjs-node-helpers/issues/4))
+- [ ] Regression ([#2](https://github.com/RonasIT/tfjs-node-helpers/issues/2))
+- [ ] Object detection ([#27](https://github.com/RonasIT/tfjs-node-helpers/issues/27))
 - [ ] Uncertainty ([#15](https://github.com/RonasIT/tfjs-node-helpers/issues/15))
 - [ ] Handle class imbalance problem ([#10](https://github.com/RonasIT/tfjs-node-helpers/issues/10))
-- [ ] Add more metrics ([#17](https://github.com/RonasIT/tfjs-node-helpers/issues/17))
 - [ ] Automated tests ([#6](https://github.com/RonasIT/tfjs-node-helpers/issues/6))
 - [ ] Continuous Integration ([#11](https://github.com/RonasIT/tfjs-node-helpers/issues/11))
+- [ ] Add an example of queued feature extraction and evaluation ([#12](https://github.com/RonasIT/tfjs-node-helpers/issues/12))
+- [ ] Add an example of storing the extracted features ([#13](https://github.com/RonasIT/tfjs-node-helpers/issues/13))
 - [ ] Add more examples ([#8](https://github.com/RonasIT/tfjs-node-helpers/issues/8))
 - [ ] API reference ([#9](https://github.com/RonasIT/tfjs-node-helpers/issues/9))
 - [ ] Dashboard to visualize metrics over time ([#7](https://github.com/RonasIT/tfjs-node-helpers/issues/7))